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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_regex.ref.match_results"></a><a class="link" href="match_results.html" title="match_results">match_results</a>
</h3></div></div></div>
<h5>
<a name="boost_regex.ref.match_results.h0"></a>
        <span class="phrase"><a name="boost_regex.ref.match_results.synopsis"></a></span><a class="link" href="match_results.html#boost_regex.ref.match_results.synopsis">Synopsis</a>
      </h5>
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">regex</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<p>
        Regular expressions are different from many simple pattern-matching algorithms
        in that as well as finding an overall match they can also produce sub-expression
        matches: each sub-expression being delimited in the pattern by a pair of
        parenthesis (...). There has to be some method for reporting sub-expression
        matches back to the user: this is achieved this by defining a class <code class="computeroutput"><span class="identifier">match_results</span></code> that acts as an indexed collection
        of sub-expression matches, each sub-expression match being contained in an
        object of type <a class="link" href="sub_match.html" title="sub_match"><code class="computeroutput"><span class="identifier">sub_match</span></code></a>.
      </p>
<p>
        Template class <code class="computeroutput"><span class="identifier">match_results</span></code>
        denotes a collection of character sequences representing the result of a
        regular expression match. Objects of type <code class="computeroutput"><span class="identifier">match_results</span></code>
        are passed to the algorithms <a class="link" href="regex_match.html" title="regex_match"><code class="computeroutput"><span class="identifier">regex_match</span></code></a> and <a class="link" href="regex_search.html" title="regex_search"><code class="computeroutput"><span class="identifier">regex_search</span></code></a>, and are returned by
        the iterator <a class="link" href="regex_iterator.html" title="regex_iterator"><code class="computeroutput"><span class="identifier">regex_iterator</span></code></a>. Storage for the
        collection is allocated and freed as necessary by the member functions of
        class <code class="computeroutput"><span class="identifier">match_results</span></code>.
      </p>
<p>
        The template class <code class="computeroutput"><span class="identifier">match_results</span></code>
        conforms to the requirements of a Sequence, as specified in (lib.sequence.reqmts),
        except that only operations defined for const-qualified Sequences are supported.
      </p>
<p>
        Class template <code class="computeroutput"><span class="identifier">match_results</span></code>
        is most commonly used as one of the typedefs <code class="computeroutput"><span class="identifier">cmatch</span></code>,
        <code class="computeroutput"><span class="identifier">wcmatch</span></code>, <code class="computeroutput"><span class="identifier">smatch</span></code>,
        or <code class="computeroutput"><span class="identifier">wsmatch</span></code>:
      </p>
<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">BidirectionalIterator</span><span class="special">,</span>
         <span class="keyword">class</span> <span class="identifier">Allocator</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">allocator</span><span class="special">&lt;</span><span class="identifier">sub_match</span><span class="special">&lt;</span><span class="identifier">BidirectionalIterator</span><span class="special">&gt;</span> <span class="special">&gt;</span>
<span class="keyword">class</span> <span class="identifier">match_results</span><span class="special">;</span>

<span class="keyword">typedef</span> <span class="identifier">match_results</span><span class="special">&lt;</span><span class="keyword">const</span> <span class="keyword">char</span><span class="special">*&gt;</span>              <span class="identifier">cmatch</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">match_results</span><span class="special">&lt;</span><span class="keyword">const</span> <span class="keyword">wchar_t</span><span class="special">*&gt;</span>           <span class="identifier">wcmatch</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">match_results</span><span class="special">&lt;</span><span class="identifier">string</span><span class="special">::</span><span class="identifier">const_iterator</span><span class="special">&gt;</span>   <span class="identifier">smatch</span><span class="special">;</span>
<span class="keyword">typedef</span> <span class="identifier">match_results</span><span class="special">&lt;</span><span class="identifier">wstring</span><span class="special">::</span><span class="identifier">const_iterator</span><span class="special">&gt;</span>  <span class="identifier">wsmatch</span><span class="special">;</span>

<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">BidirectionalIterator</span><span class="special">,</span>
         <span class="keyword">class</span> <span class="identifier">Allocator</span> <span class="special">=</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">allocator</span><span class="special">&lt;</span><span class="identifier">sub_match</span><span class="special">&lt;</span><span class="identifier">BidirectionalIterator</span><span class="special">&gt;</span> <span class="special">&gt;</span>
<span class="keyword">class</span> <span class="identifier">match_results</span>
<span class="special">{</span>
<span class="keyword">public</span><span class="special">:</span>
   <span class="keyword">typedef</span>          <span class="identifier">sub_match</span><span class="special">&lt;</span><span class="identifier">BidirectionalIterator</span><span class="special">&gt;</span>                        <span class="identifier">value_type</span><span class="special">;</span>
   <span class="keyword">typedef</span>          <span class="keyword">const</span> <span class="identifier">value_type</span><span class="special">&amp;</span>                                       <span class="identifier">const_reference</span><span class="special">;</span>
   <span class="keyword">typedef</span>          <span class="identifier">const_reference</span>                                         <span class="identifier">reference</span><span class="special">;</span>
   <span class="keyword">typedef</span>          <span class="identifier">implementation</span> <span class="identifier">defined</span>                                  <span class="identifier">const_iterator</span><span class="special">;</span>
   <span class="keyword">typedef</span>          <span class="identifier">const_iterator</span>                                          <span class="identifier">iterator</span><span class="special">;</span>
   <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">iterator_traits</span><span class="special">&lt;</span><span class="identifier">BidirectionalIterator</span><span class="special">&gt;::</span><span class="identifier">difference_type</span> <span class="identifier">difference_type</span><span class="special">;</span>
   <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">Allocator</span><span class="special">::</span><span class="identifier">size_type</span>                                    <span class="identifier">size_type</span><span class="special">;</span>
   <span class="keyword">typedef</span>          <span class="identifier">Allocator</span>                                               <span class="identifier">allocator_type</span><span class="special">;</span>
   <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">iterator_traits</span><span class="special">&lt;</span><span class="identifier">BidirectionalIterator</span><span class="special">&gt;::</span><span class="identifier">value_type</span>      <span class="identifier">char_type</span><span class="special">;</span>
   <span class="keyword">typedef</span>          <span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">char_type</span><span class="special">&gt;</span>                                 <span class="identifier">string_type</span><span class="special">;</span>

   <span class="comment">// construct/copy/destroy:</span>
   <a class="link" href="match_results.html#boost_regex.match_results.construct">explicit match_results</a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">Allocator</span><span class="special">&amp;</span> <span class="identifier">a</span> <span class="special">=</span> <span class="identifier">Allocator</span><span class="special">());</span>
   <a class="link" href="match_results.html#boost_regex.match_results.copy_construct">match_results</a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">match_results</span><span class="special">&amp;</span> <span class="identifier">m</span><span class="special">);</span>
   <a class="link" href="match_results.html#boost_regex.match_results.assign">match_results&amp; operator=</a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">match_results</span><span class="special">&amp;</span> <span class="identifier">m</span><span class="special">);</span>
   <span class="special">~</span><span class="identifier">match_results</span><span class="special">();</span>

   <span class="comment">// size:</span>
   <span class="identifier">size_type</span> <a class="link" href="match_results.html#boost_regex.match_results.size">size</a><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
   <span class="identifier">size_type</span> <a class="link" href="match_results.html#boost_regex.match_results.max_size">max_size</a><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
   <span class="keyword">bool</span> <a class="link" href="match_results.html#boost_regex.match_results.empty">empty</a><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
   <span class="comment">// element access:</span>
   <span class="identifier">difference_type</span> <a class="link" href="match_results.html#boost_regex.match_results.length">length</a><span class="special">(</span><span class="keyword">int</span> <span class="identifier">sub</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
   <span class="identifier">difference_type</span> <a class="link" href="match_results.html#boost_regex.match_results.length">length</a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">char_type</span><span class="special">*</span> <span class="identifier">sub</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">&gt;</span>
   <span class="identifier">difference_type</span> <a class="link" href="match_results.html#boost_regex.match_results.length">length</a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">charT</span><span class="special">*</span> <span class="identifier">sub</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">A</span><span class="special">&gt;</span>
   <span class="identifier">difference_type</span> <a class="link" href="match_results.html#boost_regex.match_results.length">length</a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="identifier">A</span><span class="special">&gt;&amp;</span> <span class="identifier">sub</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
   <span class="identifier">difference_type</span> <a class="link" href="match_results.html#boost_regex.match_results.position">position</a><span class="special">(</span><span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">sub</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
   <span class="identifier">difference_type</span> <a class="link" href="match_results.html#boost_regex.match_results.position">position</a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">char_type</span><span class="special">*</span> <span class="identifier">sub</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">&gt;</span>
   <span class="identifier">difference_type</span> <a class="link" href="match_results.html#boost_regex.match_results.position">position</a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">charT</span><span class="special">*</span> <span class="identifier">sub</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">A</span><span class="special">&gt;</span>
   <span class="identifier">difference_type</span> <a class="link" href="match_results.html#boost_regex.match_results.position">position</a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="identifier">A</span><span class="special">&gt;&amp;</span> <span class="identifier">sub</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
   <span class="identifier">string_type</span> <a class="link" href="match_results.html#boost_regex.match_results.str">str</a><span class="special">(</span><span class="keyword">int</span> <span class="identifier">sub</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
   <span class="identifier">string_type</span> <a class="link" href="match_results.html#boost_regex.match_results.str">str</a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">char_type</span><span class="special">*</span> <span class="identifier">sub</span><span class="special">)</span><span class="keyword">const</span><span class="special">;</span>
   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">A</span><span class="special">&gt;</span>
   <span class="identifier">string_type</span> <a class="link" href="match_results.html#boost_regex.match_results.str">str</a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">char_type</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="identifier">A</span><span class="special">&gt;&amp;</span> <span class="identifier">sub</span><span class="special">)</span><span class="keyword">const</span><span class="special">;</span>
   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">&gt;</span>
   <span class="identifier">string_type</span> <a class="link" href="match_results.html#boost_regex.match_results.str">str</a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">charT</span><span class="special">*</span> <span class="identifier">sub</span><span class="special">)</span><span class="keyword">const</span><span class="special">;</span>
   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">A</span><span class="special">&gt;</span>
   <span class="identifier">string_type</span> <a class="link" href="match_results.html#boost_regex.match_results.str">str</a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="identifier">A</span><span class="special">&gt;&amp;</span> <span class="identifier">sub</span><span class="special">)</span><span class="keyword">const</span><span class="special">;</span>
   <span class="identifier">const_reference</span> <a class="link" href="match_results.html#boost_regex.match_results.subscript">operator[]</a><span class="special">(</span><span class="keyword">int</span> <span class="identifier">n</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
   <span class="identifier">const_reference</span> <a class="link" href="match_results.html#boost_regex.match_results.subscript">operator[]</a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">char_type</span><span class="special">*</span> <span class="identifier">n</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">A</span><span class="special">&gt;</span>
   <span class="identifier">const_reference</span> <a class="link" href="match_results.html#boost_regex.match_results.subscript">operator[]</a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">char_type</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="identifier">A</span><span class="special">&gt;&amp;</span> <span class="identifier">n</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">&gt;</span>
   <span class="identifier">const_reference</span> <a class="link" href="match_results.html#boost_regex.match_results.subscript">operator[]</a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">charT</span><span class="special">*</span> <span class="identifier">n</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">A</span><span class="special">&gt;</span>
   <span class="identifier">const_reference</span> <a class="link" href="match_results.html#boost_regex.match_results.subscript">operator[]</a><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="identifier">A</span><span class="special">&gt;&amp;</span> <span class="identifier">n</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>

   <span class="identifier">const_reference</span> <a class="link" href="match_results.html#boost_regex.match_results.prefix">prefix</a><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>

   <span class="identifier">const_reference</span> <a class="link" href="match_results.html#boost_regex.match_results.suffix">suffix</a><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
   <span class="identifier">const_iterator</span> <a class="link" href="match_results.html#boost_regex.match_results.begin">begin</a><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
   <span class="identifier">const_iterator</span> <a class="link" href="match_results.html#boost_regex.match_results.end">end</a><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
   <span class="comment">// format:</span>
   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">OutputIterator</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Formatter</span><span class="special">&gt;</span>
   <span class="identifier">OutputIterator</span> <a class="link" href="match_results.html#boost_regex.match_results.format">format</a><span class="special">(</span><span class="identifier">OutputIterator</span> <span class="identifier">out</span><span class="special">,</span>
                        <span class="identifier">Formatter</span> <span class="identifier">fmt</span><span class="special">,</span>
                        <span class="identifier">match_flag_type</span> <span class="identifier">flags</span> <span class="special">=</span> <span class="identifier">format_default</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
   <span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Formatter</span><span class="special">&gt;</span>
   <span class="identifier">string_type</span> <a class="link" href="match_results.html#boost_regex.match_results.format2">format</a><span class="special">(</span><span class="identifier">Formatter</span> <span class="identifier">fmt</span><span class="special">,</span>
                     <span class="identifier">match_flag_type</span> <span class="identifier">flags</span> <span class="special">=</span> <span class="identifier">format_default</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>

   <span class="identifier">allocator_type</span> <a class="link" href="match_results.html#boost_regex.match_results.get_allocator">get_allocator</a><span class="special">()</span> <span class="keyword">const</span><span class="special">;</span>
   <span class="keyword">void</span> <a class="link" href="match_results.html#boost_regex.match_results.swap">swap</a><span class="special">(</span><span class="identifier">match_results</span><span class="special">&amp;</span> <span class="identifier">that</span><span class="special">);</span>

<span class="preprocessor">#ifdef</span> <span class="identifier">BOOST_REGEX_MATCH_EXTRA</span>
   <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">value_type</span><span class="special">::</span><span class="identifier">capture_sequence_type</span> <span class="identifier">capture_sequence_type</span><span class="special">;</span>
   <span class="keyword">const</span> <span class="identifier">capture_sequence_type</span><span class="special">&amp;</span> <a class="link" href="match_results.html#boost_regex.match_results.captures">captures</a><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">i</span><span class="special">)</span><span class="keyword">const</span><span class="special">;</span>
<span class="preprocessor">#endif</span>

<span class="special">};</span>

<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">BidirectionalIterator</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Allocator</span><span class="special">&gt;</span>
<span class="keyword">bool</span> <a class="link" href="match_results.html#boost_regex.match_results.op_eq">operator ==</a> <span class="special">(</span><span class="keyword">const</span> <span class="identifier">match_results</span><span class="special">&lt;</span><span class="identifier">BidirectionalIterator</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">&gt;&amp;</span> <span class="identifier">m1</span><span class="special">,</span>
                  <span class="keyword">const</span> <span class="identifier">match_results</span><span class="special">&lt;</span><span class="identifier">BidirectionalIterator</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">&gt;&amp;</span> <span class="identifier">m2</span><span class="special">);</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">BidirectionalIterator</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Allocator</span><span class="special">&gt;</span>
<span class="keyword">bool</span> <a class="link" href="match_results.html#boost_regex.match_results.op_ne">operator !=</a> <span class="special">(</span><span class="keyword">const</span> <span class="identifier">match_results</span><span class="special">&lt;</span><span class="identifier">BidirectionalIterator</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">&gt;&amp;</span> <span class="identifier">m1</span><span class="special">,</span>
                  <span class="keyword">const</span> <span class="identifier">match_results</span><span class="special">&lt;</span><span class="identifier">BidirectionalIterator</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">&gt;&amp;</span> <span class="identifier">m2</span><span class="special">);</span>

<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">BidirectionalIterator</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Allocator</span><span class="special">&gt;</span>
<span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">&gt;&amp;</span>
   <a class="link" href="match_results.html#boost_regex.match_results.op_stream">operator &lt;&lt;</a> <span class="special">(</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">&gt;&amp;</span> <span class="identifier">os</span><span class="special">,</span>
               <span class="keyword">const</span> <span class="identifier">match_results</span><span class="special">&lt;</span><span class="identifier">BidirectionalIterator</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">&gt;&amp;</span> <span class="identifier">m</span><span class="special">);</span>

<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">BidirectionalIterator</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Allocator</span><span class="special">&gt;</span>
<span class="keyword">void</span> <a class="link" href="match_results.html#boost_regex.match_results.op_swap">swap</a><span class="special">(</span><span class="identifier">match_results</span><span class="special">&lt;</span><span class="identifier">BidirectionalIterator</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">&gt;&amp;</span> <span class="identifier">m1</span><span class="special">,</span>
         <span class="identifier">match_results</span><span class="special">&lt;</span><span class="identifier">BidirectionalIterator</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">&gt;&amp;</span> <span class="identifier">m2</span><span class="special">);</span>
</pre>
<h5>
<a name="boost_regex.ref.match_results.h1"></a>
        <span class="phrase"><a name="boost_regex.ref.match_results.description"></a></span><a class="link" href="match_results.html#boost_regex.ref.match_results.description">Description</a>
      </h5>
<p>
        In all <code class="computeroutput"><span class="identifier">match_results</span></code> constructors,
        a copy of the Allocator argument is used for any memory allocation performed
        by the constructor or member functions during the lifetime of the object.
      </p>
<a name="boost_regex.match_results.construct"></a><pre class="programlisting"><span class="identifier">match_results</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">Allocator</span><span class="special">&amp;</span> <span class="identifier">a</span> <span class="special">=</span> <span class="identifier">Allocator</span><span class="special">());</span>
</pre>
<p>
        <span class="bold"><strong>Effects</strong></span>: Constructs an object of class
        <code class="computeroutput"><span class="identifier">match_results</span></code>. The postconditions
        of this function are indicated in the table:
      </p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                <p>
                  Element
                </p>
              </th>
<th>
                <p>
                  Value
                </p>
              </th>
</tr></thead>
<tbody>
<tr>
<td>
                <p>
                  empty()
                </p>
              </td>
<td>
                <p>
                  true
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  size()
                </p>
              </td>
<td>
                <p>
                  0
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  str()
                </p>
              </td>
<td>
                <p>
                  basic_string&lt;charT&gt;()
                </p>
              </td>
</tr>
</tbody>
</table></div>
<a name="boost_regex.match_results.copy_construct"></a><pre class="programlisting"><span class="identifier">match_results</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">match_results</span><span class="special">&amp;</span> <span class="identifier">m</span><span class="special">);</span>
</pre>
<p>
        <span class="bold"><strong>Effects</strong></span>: Constructs an object of class match_results,
        as a copy of m.
      </p>
<a name="boost_regex.match_results.assign"></a><pre class="programlisting"><span class="identifier">match_results</span><span class="special">&amp;</span> <span class="keyword">operator</span><span class="special">=(</span><span class="keyword">const</span> <span class="identifier">match_results</span><span class="special">&amp;</span> <span class="identifier">m</span><span class="special">);</span>
</pre>
<p>
        <span class="bold"><strong>Effects</strong></span>: Assigns m to *this. The postconditions
        of this function are indicated in the table:
      </p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                <p>
                  Element
                </p>
              </th>
<th>
                <p>
                  Value
                </p>
              </th>
</tr></thead>
<tbody>
<tr>
<td>
                <p>
                  empty()
                </p>
              </td>
<td>
                <p>
                  m.empty().
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  size()
                </p>
              </td>
<td>
                <p>
                  m.size().
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  str(n)
                </p>
              </td>
<td>
                <p>
                  m.str(n) for all integers n &lt; m.size().
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  prefix()
                </p>
              </td>
<td>
                <p>
                  m.prefix().
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  suffix()
                </p>
              </td>
<td>
                <p>
                  m.suffix().
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  (*this)[n]
                </p>
              </td>
<td>
                <p>
                  m[n] for all integers n &lt; m.size().
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  length(n)
                </p>
              </td>
<td>
                <p>
                  m.length(n) for all integers n &lt; m.size().
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  position(n)
                </p>
              </td>
<td>
                <p>
                  m.position(n) for all integers n &lt; m.size().
                </p>
              </td>
</tr>
</tbody>
</table></div>
<a name="boost_regex.match_results.size"></a><pre class="programlisting"><span class="identifier">size_type</span> <span class="identifier">size</span><span class="special">()</span><span class="keyword">const</span><span class="special">;</span>
</pre>
<p>
        <span class="bold"><strong>Effects</strong></span>: Returns the number of <a class="link" href="sub_match.html" title="sub_match"><code class="computeroutput"><span class="identifier">sub_match</span></code></a> elements stored in *this;
        that is the number of marked sub-expressions in the regular expression that
        was matched plus one.
      </p>
<a name="boost_regex.match_results.max_size"></a><pre class="programlisting"><span class="identifier">size_type</span> <span class="identifier">max_size</span><span class="special">()</span><span class="keyword">const</span><span class="special">;</span>
</pre>
<p>
        <span class="bold"><strong>Effects</strong></span>: Returns the maximum number of
        <a class="link" href="sub_match.html" title="sub_match"><code class="computeroutput"><span class="identifier">sub_match</span></code></a>
        elements that can be stored in *this.
      </p>
<a name="boost_regex.match_results.empty"></a><pre class="programlisting"><span class="keyword">bool</span> <span class="identifier">empty</span><span class="special">()</span><span class="keyword">const</span><span class="special">;</span>
</pre>
<p>
        <span class="bold"><strong>Effects</strong></span>: Returns size() == 0.
      </p>
<a name="boost_regex.match_results.length"></a><pre class="programlisting"><span class="identifier">difference_type</span> <span class="identifier">length</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">sub</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="keyword">const</span><span class="special">;</span>
<span class="identifier">difference_type</span> <span class="identifier">length</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">char_type</span><span class="special">*</span> <span class="identifier">sub</span><span class="special">)</span><span class="keyword">const</span><span class="special">;</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">&gt;</span>
<span class="identifier">difference_type</span> <span class="identifier">length</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">charT</span><span class="special">*</span> <span class="identifier">sub</span><span class="special">)</span><span class="keyword">const</span><span class="special">;</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">A</span><span class="special">&gt;</span>
<span class="identifier">difference_type</span> <span class="identifier">length</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="identifier">A</span><span class="special">&gt;&amp;)</span><span class="keyword">const</span><span class="special">;</span>
</pre>
<p>
        <span class="bold"><strong>Requires</strong></span>: that the match_results object
        has been initialized as a result of a successful call to <a class="link" href="regex_search.html" title="regex_search"><code class="computeroutput"><span class="identifier">regex_search</span></code></a> or <a class="link" href="regex_match.html" title="regex_match"><code class="computeroutput"><span class="identifier">regex_match</span></code></a> or was returned from
        a <a class="link" href="regex_iterator.html" title="regex_iterator"><code class="computeroutput"><span class="identifier">regex_iterator</span></code></a>,
        and that the underlying iterators have not been subsequently invalidated.
        Will raise a <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">logic_error</span></code> if the match_results object
        was not initialized.
      </p>
<p>
        <span class="bold"><strong>Effects</strong></span>: Returns the length of sub-expression
        <span class="emphasis"><em>sub</em></span>, that is to say: <code class="computeroutput"><span class="special">(*</span><span class="keyword">this</span><span class="special">)[</span><span class="identifier">sub</span><span class="special">].</span><span class="identifier">length</span><span class="special">()</span></code>.
      </p>
<p>
        The overloads that accept a string refer to a named sub-expression <span class="emphasis"><em>n</em></span>.
        In the event that there is no such named sub-expression then returns zero.
      </p>
<p>
        The template overloads of this function, allow the string and/or character
        type to be different from the character type of the underlying sequence and/or
        regular expression: in this case the characters will be widened to the underlying
        character type of the original regular expression. A compiler error will
        occur if the argument passes a wider character type than the underlying sequence.
        These overloads allow a normal narrow character C string literal to be used
        as an argument, even when the underlying character type of the expression
        being matched may be something more exotic such as a Unicode character type.
      </p>
<a name="boost_regex.match_results.position"></a><pre class="programlisting"><span class="identifier">difference_type</span> <span class="identifier">position</span><span class="special">(</span><span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">sub</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="keyword">const</span><span class="special">;</span>
<span class="identifier">difference_type</span> <span class="identifier">position</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">char_type</span><span class="special">*</span> <span class="identifier">sub</span><span class="special">)</span><span class="keyword">const</span><span class="special">;</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">&gt;</span>
<span class="identifier">difference_type</span> <span class="identifier">position</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">charT</span><span class="special">*</span> <span class="identifier">sub</span><span class="special">)</span><span class="keyword">const</span><span class="special">;</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">A</span><span class="special">&gt;</span>
<span class="identifier">difference_type</span> <span class="identifier">position</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="identifier">A</span><span class="special">&gt;&amp;)</span><span class="keyword">const</span><span class="special">;</span>
</pre>
<p>
        <span class="bold"><strong>Requires</strong></span>: that the match_results object
        has been initialized as a result of a successful call to <a class="link" href="regex_search.html" title="regex_search"><code class="computeroutput"><span class="identifier">regex_search</span></code></a> or <a class="link" href="regex_match.html" title="regex_match"><code class="computeroutput"><span class="identifier">regex_match</span></code></a> or was returned from
        a <a class="link" href="regex_iterator.html" title="regex_iterator"><code class="computeroutput"><span class="identifier">regex_iterator</span></code></a>,
        and that the underlying iterators have not been subsequently invalidated.
        Will raise a <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">logic_error</span></code> if the match_results object
        was not initialized.
      </p>
<p>
        <span class="bold"><strong>Effects</strong></span>: Returns the starting location of
        sub-expression <span class="emphasis"><em>sub</em></span>, or -1 if <span class="emphasis"><em>sub</em></span>
        was not matched. Note that if this represents a partial match , then <code class="computeroutput"><span class="identifier">position</span><span class="special">()</span></code>
        will return the location of the partial match even though <code class="computeroutput"><span class="special">(*</span><span class="keyword">this</span><span class="special">)[</span><span class="number">0</span><span class="special">].</span><span class="identifier">matched</span></code>
        is false.
      </p>
<p>
        The overloads that accept a string refer to a named sub-expression <span class="emphasis"><em>n</em></span>.
        In the event that there is no such named sub-expression then returns -1.
      </p>
<p>
        The template overloads of this function, allow the string and/or character
        type to be different from the character type of the underlying sequence and/or
        regular expression: in this case the characters will be widened to the underlying
        character type of the original regular expression. A compiler error will
        occur if the argument passes a wider character type than the underlying sequence.
        These overloads allow a normal narrow character C string literal to be used
        as an argument, even when the underlying character type of the expression
        being matched may be something more exotic such as a Unicode character type.
      </p>
<a name="boost_regex.match_results.str"></a><pre class="programlisting"><span class="identifier">string_type</span> <span class="identifier">str</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">sub</span> <span class="special">=</span> <span class="number">0</span><span class="special">)</span><span class="keyword">const</span><span class="special">;</span>
<span class="identifier">string_type</span> <span class="identifier">str</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">char_type</span><span class="special">*</span> <span class="identifier">sub</span><span class="special">)</span><span class="keyword">const</span><span class="special">;</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">A</span><span class="special">&gt;</span>
<span class="identifier">string_type</span> <span class="identifier">str</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">char_type</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="identifier">A</span><span class="special">&gt;&amp;</span> <span class="identifier">sub</span><span class="special">)</span><span class="keyword">const</span><span class="special">;</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">&gt;</span>
<span class="identifier">string_type</span> <span class="identifier">str</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">charT</span><span class="special">*</span> <span class="identifier">sub</span><span class="special">)</span><span class="keyword">const</span><span class="special">;</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">A</span><span class="special">&gt;</span>
<span class="identifier">string_type</span> <span class="identifier">str</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="identifier">A</span><span class="special">&gt;&amp;</span> <span class="identifier">sub</span><span class="special">)</span><span class="keyword">const</span><span class="special">;</span>
</pre>
<p>
        <span class="bold"><strong>Requires</strong></span>: that the match_results object
        has been initialized as a result of a successful call to <a class="link" href="regex_search.html" title="regex_search"><code class="computeroutput"><span class="identifier">regex_search</span></code></a> or <a class="link" href="regex_match.html" title="regex_match"><code class="computeroutput"><span class="identifier">regex_match</span></code></a> or was returned from
        a <a class="link" href="regex_iterator.html" title="regex_iterator"><code class="computeroutput"><span class="identifier">regex_iterator</span></code></a>,
        and that the underlying iterators have not been subsequently invalidated.
        Will raise a <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">logic_error</span></code> if the match_results object
        was not initialized.
      </p>
<p>
        <span class="bold"><strong>Effects</strong></span>: Returns sub-expression <span class="emphasis"><em>sub</em></span>
        as a string: <code class="computeroutput"><span class="identifier">string_type</span><span class="special">((*</span><span class="keyword">this</span><span class="special">)[</span><span class="identifier">sub</span><span class="special">])</span></code>.
      </p>
<p>
        The overloads that accept a string, return the string that matched the named
        sub-expression <span class="emphasis"><em>n</em></span>. In the event that there is no such
        named sub-expression then returns an empty string.
      </p>
<p>
        The template overloads of this function, allow the string and/or character
        type to be different from the character type of the underlying sequence and/or
        regular expression: in this case the characters will be widened to the underlying
        character type of the original regular expression. A compiler error will
        occur if the argument passes a wider character type than the underlying sequence.
        These overloads allow a normal narrow character C string literal to be used
        as an argument, even when the underlying character type of the expression
        being matched may be something more exotic such as a Unicode character type.
      </p>
<a name="boost_regex.match_results.subscript"></a><pre class="programlisting"><span class="identifier">const_reference</span> <span class="keyword">operator</span><span class="special">[](</span><span class="keyword">int</span> <span class="identifier">n</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="identifier">const_reference</span> <span class="keyword">operator</span><span class="special">[](</span><span class="keyword">const</span> <span class="identifier">char_type</span><span class="special">*</span> <span class="identifier">n</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">A</span><span class="special">&gt;</span>
<span class="identifier">const_reference</span> <span class="keyword">operator</span><span class="special">[](</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">char_type</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="identifier">A</span><span class="special">&gt;&amp;</span> <span class="identifier">n</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">&gt;</span>
<span class="identifier">const_reference</span> <span class="keyword">operator</span><span class="special">[](</span><span class="keyword">const</span> <span class="identifier">charT</span><span class="special">*</span> <span class="identifier">n</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">A</span><span class="special">&gt;</span>
<span class="identifier">const_reference</span> <span class="keyword">operator</span><span class="special">[](</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">Traits</span><span class="special">,</span> <span class="identifier">A</span><span class="special">&gt;&amp;</span> <span class="identifier">n</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
</pre>
<p>
        <span class="bold"><strong>Requires</strong></span>: that the match_results object
        has been initialized as a result of a successful call to <a class="link" href="regex_search.html" title="regex_search"><code class="computeroutput"><span class="identifier">regex_search</span></code></a> or <a class="link" href="regex_match.html" title="regex_match"><code class="computeroutput"><span class="identifier">regex_match</span></code></a> or was returned from
        a <a class="link" href="regex_iterator.html" title="regex_iterator"><code class="computeroutput"><span class="identifier">regex_iterator</span></code></a>,
        and that the underlying iterators have not been subsequently invalidated.
        Will raise a <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">logic_error</span></code> if the match_results object
        was not initialized.
      </p>
<p>
        <span class="bold"><strong>Effects</strong></span>: Returns a reference to the <a class="link" href="sub_match.html" title="sub_match"><code class="computeroutput"><span class="identifier">sub_match</span></code></a>
        object representing the character sequence that matched marked sub-expression
        <span class="emphasis"><em>n</em></span>. If <code class="computeroutput"><span class="identifier">n</span> <span class="special">==</span> <span class="number">0</span></code> then returns
        a reference to a <a class="link" href="sub_match.html" title="sub_match"><code class="computeroutput"><span class="identifier">sub_match</span></code></a> object representing the
        character sequence that matched the whole regular expression. If <span class="emphasis"><em>n</em></span>
        is out of range, or if <span class="emphasis"><em>n</em></span> is an unmatched sub-expression,
        then returns a <a class="link" href="sub_match.html" title="sub_match"><code class="computeroutput"><span class="identifier">sub_match</span></code></a>
        object whose matched member is false.
      </p>
<p>
        The overloads that accept a string, return a reference to the <a class="link" href="sub_match.html" title="sub_match"><code class="computeroutput"><span class="identifier">sub_match</span></code></a> object representing the
        character sequence that matched the named sub-expression <span class="emphasis"><em>n</em></span>.
        In the event that there is no such named sub-expression then returns a <a class="link" href="sub_match.html" title="sub_match"><code class="computeroutput"><span class="identifier">sub_match</span></code></a>
        object whose matched member is false.
      </p>
<p>
        The template overloads of this function, allow the string and/or character
        type to be different from the character type of the underlying sequence and/or
        regular expression: in this case the characters will be widened to the underlying
        character type of the original regular expression. A compiler error will
        occur if the argument passes a wider character type than the underlying sequence.
        These overloads allow a normal narrow character C string literal to be used
        as an argument, even when the underlying character type of the expression
        being matched may be something more exotic such as a Unicode character type.
      </p>
<a name="boost_regex.match_results.prefix"></a><pre class="programlisting"><span class="identifier">const_reference</span> <span class="identifier">prefix</span><span class="special">()</span><span class="keyword">const</span><span class="special">;</span>
</pre>
<p>
        <span class="bold"><strong>Requires</strong></span>: that the match_results object
        has been initialized as a result of a successful call to <a class="link" href="regex_search.html" title="regex_search"><code class="computeroutput"><span class="identifier">regex_search</span></code></a> or <a class="link" href="regex_match.html" title="regex_match"><code class="computeroutput"><span class="identifier">regex_match</span></code></a> or was returned from
        a <a class="link" href="regex_iterator.html" title="regex_iterator"><code class="computeroutput"><span class="identifier">regex_iterator</span></code></a>,
        and that the underlying iterators have not been subsequently invalidated.
        Will raise a <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">logic_error</span></code> if the match_results object
        was not initialized.
      </p>
<p>
        <span class="bold"><strong>Effects</strong></span>: Returns a reference to the <a class="link" href="sub_match.html" title="sub_match"><code class="computeroutput"><span class="identifier">sub_match</span></code></a>
        object representing the character sequence from the start of the string being
        matched or searched, to the start of the match found.
      </p>
<a name="boost_regex.match_results.suffix"></a><pre class="programlisting"><span class="identifier">const_reference</span> <span class="identifier">suffix</span><span class="special">()</span><span class="keyword">const</span><span class="special">;</span>
</pre>
<p>
        <span class="bold"><strong>Requires</strong></span>: that the match_results object
        has been initialized as a result of a successful call to <a class="link" href="regex_search.html" title="regex_search"><code class="computeroutput"><span class="identifier">regex_search</span></code></a> or <a class="link" href="regex_match.html" title="regex_match"><code class="computeroutput"><span class="identifier">regex_match</span></code></a> or was returned from
        a <a class="link" href="regex_iterator.html" title="regex_iterator"><code class="computeroutput"><span class="identifier">regex_iterator</span></code></a>,
        and that the underlying iterators have not been subsequently invalidated.
        Will raise a <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">logic_error</span></code> if the match_results object
        was not initialized.
      </p>
<p>
        <span class="bold"><strong>Effects</strong></span>: Returns a reference to the <a class="link" href="sub_match.html" title="sub_match"><code class="computeroutput"><span class="identifier">sub_match</span></code></a>
        object representing the character sequence from the end of the match found
        to the end of the string being matched or searched.
      </p>
<a name="boost_regex.match_results.begin"></a><pre class="programlisting"><span class="identifier">const_iterator</span> <span class="identifier">begin</span><span class="special">()</span><span class="keyword">const</span><span class="special">;</span>
</pre>
<p>
        <span class="bold"><strong>Effects</strong></span>: Returns a starting iterator that
        enumerates over all the marked sub-expression matches stored in *this.
      </p>
<a name="boost_regex.match_results.end"></a><pre class="programlisting"><span class="identifier">const_iterator</span> <span class="identifier">end</span><span class="special">()</span><span class="keyword">const</span><span class="special">;</span>
</pre>
<p>
        <span class="bold"><strong>Effects</strong></span>: Returns a terminating iterator
        that enumerates over all the marked sub-expression matches stored in *this.
      </p>
<a name="boost_regex.match_results_format"></a><a name="boost_regex.match_results.format"></a><pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">OutputIterator</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Formatter</span><span class="special">&gt;</span>
<span class="identifier">OutputIterator</span> <span class="identifier">format</span><span class="special">(</span><span class="identifier">OutputIterator</span> <span class="identifier">out</span><span class="special">,</span>
                      <span class="identifier">Formatter</span> <span class="identifier">fmt</span><span class="special">,</span>
                      <span class="identifier">match_flag_type</span> <span class="identifier">flags</span> <span class="special">=</span> <span class="identifier">format_default</span><span class="special">);</span>
</pre>
<p>
        <span class="bold"><strong>Requires</strong></span>: The type <code class="computeroutput"><span class="identifier">OutputIterator</span></code>
        conforms to the Output Iterator requirements (C++ std 24.1.2).
      </p>
<p>
        The type <code class="computeroutput"><span class="identifier">Formatter</span></code> must be
        either a pointer to a null-terminated string of type <code class="computeroutput"><span class="identifier">char_type</span><span class="special">[]</span></code>, or be a container of <code class="computeroutput"><span class="identifier">char_type</span></code>'s
        (for example <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">char_type</span><span class="special">&gt;</span></code>)
        or be a unary, binary or ternary functor that computes the replacement string
        from a function call: either <code class="computeroutput"><span class="identifier">fmt</span><span class="special">(*</span><span class="keyword">this</span><span class="special">)</span></code>
        which must return a container of <code class="computeroutput"><span class="identifier">char_type</span></code>'s
        to be used as the replacement text, or either <code class="computeroutput"><span class="identifier">fmt</span><span class="special">(*</span><span class="keyword">this</span><span class="special">,</span>
        <span class="identifier">out</span><span class="special">)</span></code>
        or <code class="computeroutput"><span class="identifier">fmt</span><span class="special">(*</span><span class="keyword">this</span><span class="special">,</span> <span class="identifier">out</span><span class="special">,</span> <span class="identifier">flags</span><span class="special">)</span></code>, both of which write the replacement text
        to <code class="computeroutput"><span class="special">*</span><span class="identifier">out</span></code>,
        and then return the new OutputIterator position. Note that if the formatter
        is a functor, then it is <span class="emphasis"><em>passed by value</em></span>: users that
        want to pass function objects with internal state might want to use <a href="../../../../../../doc/html/ref.html" target="_top">Boost.Ref</a> to wrap the object
        so that it's passed by reference.
      </p>
<p>
        <span class="bold"><strong>Requires</strong></span>: that the match_results object
        has been initialized as a result of a successful call to <a class="link" href="regex_search.html" title="regex_search"><code class="computeroutput"><span class="identifier">regex_search</span></code></a> or <a class="link" href="regex_match.html" title="regex_match"><code class="computeroutput"><span class="identifier">regex_match</span></code></a> or was returned from
        a <a class="link" href="regex_iterator.html" title="regex_iterator"><code class="computeroutput"><span class="identifier">regex_iterator</span></code></a>,
        and that the underlying iterators have not been subsequently invalidated.
        Will raise a <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">logic_error</span></code> if the match_results object
        was not initialized.
      </p>
<p>
        <span class="bold"><strong>Effects</strong></span>: If <code class="computeroutput"><span class="identifier">fmt</span></code>
        is either a null-terminated string, or a container of <code class="computeroutput"><span class="identifier">char_type</span></code>'s,
        then copies the character sequence <code class="computeroutput"><span class="special">[</span><span class="identifier">fmt</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">fmt</span><span class="special">.</span><span class="identifier">end</span><span class="special">())</span></code>
        to <code class="computeroutput"><span class="identifier">OutputIterator</span></code> <span class="emphasis"><em>out</em></span>.
        For each format specifier or escape sequence in <span class="emphasis"><em>fmt</em></span>,
        replace that sequence with either the character(s) it represents, or the
        sequence of characters within <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code> to which it refers. The bitmasks specified
        in flags determines what format specifiers or escape sequences are recognized,
        by default this is the format used by ECMA-262, ECMAScript Language Specification,
        Chapter 15 part 5.4.11 String.prototype.replace.
      </p>
<p>
        If <code class="computeroutput"><span class="identifier">fmt</span></code> is a function object,
        then depending on the number of arguments the function object accepts, it
        will either:
      </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
            Call <code class="computeroutput"><span class="identifier">fmt</span><span class="special">(*</span><span class="keyword">this</span><span class="special">)</span></code>
            and copy the string returned to <code class="computeroutput"><span class="identifier">OutputIterator</span></code>
            <span class="emphasis"><em>out</em></span>.
          </li>
<li class="listitem">
            Call <code class="computeroutput"><span class="identifier">fmt</span><span class="special">(*</span><span class="keyword">this</span><span class="special">,</span> <span class="identifier">out</span><span class="special">)</span></code>.
          </li>
<li class="listitem">
            Call <code class="computeroutput"><span class="identifier">fmt</span><span class="special">(*</span><span class="keyword">this</span><span class="special">,</span> <span class="identifier">out</span><span class="special">,</span> <span class="identifier">flags</span><span class="special">)</span></code>.
          </li>
</ul></div>
<p>
        In all cases the new position of the <code class="computeroutput"><span class="identifier">OutputIterator</span></code>
        is returned.
      </p>
<p>
        See the <a class="link" href="../format.html" title="Search and Replace Format String Syntax">format syntax guide for more information</a>.
      </p>
<p>
        <span class="bold"><strong>Returns</strong></span>: out.
      </p>
<a name="boost_regex.match_results.format2"></a><pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">Formatter</span><span class="special">&gt;</span>
<span class="identifier">string_type</span> <span class="identifier">format</span><span class="special">(</span><span class="identifier">Formatter</span> <span class="identifier">fmt</span><span class="special">,</span>
                   <span class="identifier">match_flag_type</span> <span class="identifier">flags</span> <span class="special">=</span> <span class="identifier">format_default</span><span class="special">);</span>
</pre>
<p>
        <span class="bold"><strong>Requires</strong></span> The type <code class="computeroutput"><span class="identifier">Formatter</span></code>
        must be either a pointer to a null-terminated string of type <code class="computeroutput"><span class="identifier">char_type</span><span class="special">[]</span></code>,
        or be a container of <code class="computeroutput"><span class="identifier">char_type</span></code>'s
        (for example <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special">&lt;</span><span class="identifier">char_type</span><span class="special">&gt;</span></code>)
        or be a unary, binary or ternary functor that computes the replacement string
        from a function call: either <code class="computeroutput"><span class="identifier">fmt</span><span class="special">(*</span><span class="keyword">this</span><span class="special">)</span></code>
        which must return a container of <code class="computeroutput"><span class="identifier">char_type</span></code>'s
        to be used as the replacement text, or either <code class="computeroutput"><span class="identifier">fmt</span><span class="special">(*</span><span class="keyword">this</span><span class="special">,</span>
        <span class="identifier">out</span><span class="special">)</span></code>
        or <code class="computeroutput"><span class="identifier">fmt</span><span class="special">(*</span><span class="keyword">this</span><span class="special">,</span> <span class="identifier">out</span><span class="special">,</span> <span class="identifier">flags</span><span class="special">)</span></code>, both of which write the replacement text
        to <code class="computeroutput"><span class="special">*</span><span class="identifier">out</span></code>,
        and then return the new OutputIterator position.
      </p>
<p>
        <span class="bold"><strong>Requires</strong></span>: that the match_results object
        has been initialized as a result of a successful call to <a class="link" href="regex_search.html" title="regex_search"><code class="computeroutput"><span class="identifier">regex_search</span></code></a> or <a class="link" href="regex_match.html" title="regex_match"><code class="computeroutput"><span class="identifier">regex_match</span></code></a> or was returned from
        a <a class="link" href="regex_iterator.html" title="regex_iterator"><code class="computeroutput"><span class="identifier">regex_iterator</span></code></a>,
        and that the underlying iterators have not been subsequently invalidated.
        Will raise a <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">logic_error</span></code> if the match_results object
        was not initialized.
      </p>
<p>
        <span class="bold"><strong>Effects</strong></span>: If <code class="computeroutput"><span class="identifier">fmt</span></code>
        is either a null-terminated string, or a container of <code class="computeroutput"><span class="identifier">char_type</span></code>'s,
        then copies the string <span class="emphasis"><em>fmt</em></span>: For each format specifier
        or escape sequence in <span class="emphasis"><em>fmt</em></span>, replace that sequence with
        either the character(s) it represents, or the sequence of characters within
        <code class="computeroutput"><span class="special">*</span><span class="keyword">this</span></code>
        to which it refers. The bitmasks specified in flags determines what format
        specifiers or escape sequences are recognized, by default this is the format
        used by ECMA-262, ECMAScript Language Specification, Chapter 15 part 5.4.11
        String.prototype.replace.
      </p>
<p>
        If <code class="computeroutput"><span class="identifier">fmt</span></code> is a function object,
        then depending on the number of arguments the function object accepts, it
        will either:
      </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
            Call <code class="computeroutput"><span class="identifier">fmt</span><span class="special">(*</span><span class="keyword">this</span><span class="special">)</span></code>
            and return the result.
          </li>
<li class="listitem">
            Call <code class="computeroutput"><span class="identifier">fmt</span><span class="special">(*</span><span class="keyword">this</span><span class="special">,</span> <span class="identifier">unspecified</span><span class="special">-</span><span class="identifier">output</span><span class="special">-</span><span class="identifier">iterator</span><span class="special">)</span></code>,
            where <code class="computeroutput"><span class="identifier">unspecified</span><span class="special">-</span><span class="identifier">output</span><span class="special">-</span><span class="identifier">iterator</span></code> is an unspecified OutputIterator
            type used to copy the output to the string result.
          </li>
<li class="listitem">
            Call <code class="computeroutput"><span class="identifier">fmt</span><span class="special">(*</span><span class="keyword">this</span><span class="special">,</span> <span class="identifier">unspecified</span><span class="special">-</span><span class="identifier">output</span><span class="special">-</span><span class="identifier">iterator</span><span class="special">,</span>
            <span class="identifier">flags</span><span class="special">)</span></code>,
            where <code class="computeroutput"><span class="identifier">unspecified</span><span class="special">-</span><span class="identifier">output</span><span class="special">-</span><span class="identifier">iterator</span></code> is an unspecified OutputIterator
            type used to copy the output to the string result.
          </li>
</ul></div>
<p>
        See the <a class="link" href="../format.html" title="Search and Replace Format String Syntax">format syntax guide for more information</a>.
      </p>
<a name="boost_regex.match_results.get_allocator"></a><pre class="programlisting"><span class="identifier">allocator_type</span> <span class="identifier">get_allocator</span><span class="special">()</span><span class="keyword">const</span><span class="special">;</span>
</pre>
<p>
        <span class="bold"><strong>Effects</strong></span>: Returns a copy of the Allocator
        that was passed to the object's constructor.
      </p>
<a name="boost_regex.match_results.swap"></a><pre class="programlisting"><span class="keyword">void</span> <span class="identifier">swap</span><span class="special">(</span><span class="identifier">match_results</span><span class="special">&amp;</span> <span class="identifier">that</span><span class="special">);</span>
</pre>
<p>
        <span class="bold"><strong>Effects</strong></span>: Swaps the contents of the two sequences.
      </p>
<p>
        <span class="bold"><strong>Postcondition</strong></span>: *this contains the sequence
        of matched sub-expressions that were in that, that contains the sequence
        of matched sub-expressions that were in *this.
      </p>
<p>
        <span class="bold"><strong>Complexity</strong></span>: constant time.
      </p>
<a name="boost_regex.match_results.capture_type"></a><pre class="programlisting"><span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">value_type</span><span class="special">::</span><span class="identifier">capture_sequence_type</span> <span class="identifier">capture_sequence_type</span><span class="special">;</span>
</pre>
<p>
        Defines an implementation-specific type that satisfies the requirements of
        a standard library Sequence (21.1.1 including the optional Table 68 operations),
        whose value_type is a <code class="computeroutput"><span class="identifier">sub_match</span><span class="special">&lt;</span><span class="identifier">BidirectionalIterator</span><span class="special">&gt;</span></code>. This type happens to be <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special">&lt;</span><span class="identifier">sub_match</span><span class="special">&lt;</span><span class="identifier">BidirectionalIterator</span><span class="special">&gt;</span> <span class="special">&gt;</span></code>,
        but you shouldn't actually rely on that.
      </p>
<a name="boost_regex.match_results.captures"></a><pre class="programlisting"><span class="keyword">const</span> <span class="identifier">capture_sequence_type</span><span class="special">&amp;</span> <span class="identifier">captures</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span> <span class="identifier">i</span><span class="special">)</span><span class="keyword">const</span><span class="special">;</span>
</pre>
<p>
        <span class="bold"><strong>Requires</strong></span>: that the match_results object
        has been initialized as a result of a successful call to <a class="link" href="regex_search.html" title="regex_search"><code class="computeroutput"><span class="identifier">regex_search</span></code></a> or <a class="link" href="regex_match.html" title="regex_match"><code class="computeroutput"><span class="identifier">regex_match</span></code></a> or was returned from
        a <a class="link" href="regex_iterator.html" title="regex_iterator"><code class="computeroutput"><span class="identifier">regex_iterator</span></code></a>,
        and that the underlying iterators have not been subsequently invalidated.
        Will raise a <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">logic_error</span></code> if the match_results object
        was not initialized.
      </p>
<p>
        <span class="bold"><strong>Effects</strong></span>: returns a sequence containing all
        the captures obtained for sub-expression i.
      </p>
<p>
        <span class="bold"><strong>Returns</strong></span>: <code class="computeroutput"><span class="special">(*</span><span class="keyword">this</span><span class="special">)[</span><span class="identifier">i</span><span class="special">].</span><span class="identifier">captures</span><span class="special">();</span></code>
      </p>
<p>
        <span class="bold"><strong>Preconditions</strong></span>: the library must be built
        and used with BOOST_REGEX_MATCH_EXTRA defined, and you must pass the flag
        match_extra to the regex matching functions ( <a class="link" href="regex_match.html" title="regex_match"><code class="computeroutput"><span class="identifier">regex_match</span></code></a>, <a class="link" href="regex_search.html" title="regex_search"><code class="computeroutput"><span class="identifier">regex_search</span></code></a>, <a class="link" href="regex_iterator.html" title="regex_iterator"><code class="computeroutput"><span class="identifier">regex_iterator</span></code></a> or <a class="link" href="regex_token_iterator.html" title="regex_token_iterator"><code class="computeroutput"><span class="identifier">regex_token_iterator</span></code></a>) in order for
        this member function to be defined and return useful information.
      </p>
<p>
        <span class="bold"><strong>Rationale</strong></span>: Enabling this feature has several
        consequences:
      </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
            sub_match occupies more memory resulting in complex expressions running
            out of memory or stack space more quickly during matching.
          </li>
<li class="listitem">
            The matching algorithms are less efficient at handling some features
            (independent sub-expressions for example), even when match_extra is not
            used.
          </li>
<li class="listitem">
            The matching algorithms are much less efficient (i.e. slower), when match_extra
            is used. Mostly this is down to the extra memory allocations that have
            to take place.
          </li>
</ul></div>
<a name="boost_regex.match_results.op_eq"></a><pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">BidirectionalIterator</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Allocator</span><span class="special">&gt;</span>
<span class="keyword">bool</span> <span class="keyword">operator</span> <span class="special">==</span> <span class="special">(</span><span class="keyword">const</span> <span class="identifier">match_results</span><span class="special">&lt;</span><span class="identifier">BidirectionalIterator</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">&gt;&amp;</span> <span class="identifier">m1</span><span class="special">,</span>
                  <span class="keyword">const</span> <span class="identifier">match_results</span><span class="special">&lt;</span><span class="identifier">BidirectionalIterator</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">&gt;&amp;</span> <span class="identifier">m2</span><span class="special">);</span>
</pre>
<p>
        <span class="bold"><strong>Effects</strong></span>: Compares the two sequences for
        equality.
      </p>
<a name="boost_regex.match_results.op_ne"></a><pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">BidirectionalIterator</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Allocator</span><span class="special">&gt;</span>
<span class="keyword">bool</span> <span class="keyword">operator</span> <span class="special">!=</span> <span class="special">(</span><span class="keyword">const</span> <span class="identifier">match_results</span><span class="special">&lt;</span><span class="identifier">BidirectionalIterator</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">&gt;&amp;</span> <span class="identifier">m1</span><span class="special">,</span>
                  <span class="keyword">const</span> <span class="identifier">match_results</span><span class="special">&lt;</span><span class="identifier">BidirectionalIterator</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">&gt;&amp;</span> <span class="identifier">m2</span><span class="special">);</span>
</pre>
<p>
        <span class="bold"><strong>Effects</strong></span>: Compares the two sequences for
        inequality.
      </p>
<a name="boost_regex.match_results.op_stream"></a><pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">charT</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">traits</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">BidirectionalIterator</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Allocator</span><span class="special">&gt;</span>
<span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">&gt;&amp;</span>
   <span class="keyword">operator</span> <span class="special">&lt;&lt;</span> <span class="special">(</span><span class="identifier">basic_ostream</span><span class="special">&lt;</span><span class="identifier">charT</span><span class="special">,</span> <span class="identifier">traits</span><span class="special">&gt;&amp;</span> <span class="identifier">os</span><span class="special">,</span>
               <span class="keyword">const</span> <span class="identifier">match_results</span><span class="special">&lt;</span><span class="identifier">BidirectionalIterator</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">&gt;&amp;</span> <span class="identifier">m</span><span class="special">);</span>
</pre>
<p>
        <span class="bold"><strong>Effects</strong></span>: Writes the contents of <span class="emphasis"><em>m</em></span>
        to the stream <span class="emphasis"><em>os</em></span> as if by calling <code class="computeroutput"><span class="identifier">os</span>
        <span class="special">&lt;&lt;</span> <span class="identifier">m</span><span class="special">.</span><span class="identifier">str</span><span class="special">()</span></code>;
        Returns <span class="emphasis"><em>os</em></span>.
      </p>
<a name="boost_regex.match_results.op_swap"></a><pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">BidirectionalIterator</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Allocator</span><span class="special">&gt;</span>
<span class="keyword">void</span> <span class="identifier">swap</span><span class="special">(</span><span class="identifier">match_results</span><span class="special">&lt;</span><span class="identifier">BidirectionalIterator</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">&gt;&amp;</span> <span class="identifier">m1</span><span class="special">,</span>
         <span class="identifier">match_results</span><span class="special">&lt;</span><span class="identifier">BidirectionalIterator</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">&gt;&amp;</span> <span class="identifier">m2</span><span class="special">);</span>
</pre>
<p>
        <span class="bold"><strong>Effects</strong></span>: Swaps the contents of the two sequences.
      </p>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="right"><div class="copyright-footer">Copyright © 1998-2013 John Maddock<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
</div></td>
</tr></table>
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